Figure 7From: Hierarchical modularity of nested bow-ties in metabolic networksCorresponding sub-tree and bow-tie structure of module 3. (A) Sub-tree of module 3 (B) Bow-tie structure ofmodule 3 Each branch of the sub-tree corresponds to a red node in module 3, while the pink node titled "OASUC" also has parallelism in the sub-tree because it is included in the Core of E.coli network. These nodes were resulted from the decomposition of the Core. Then by the "majority role" the Core clusters were expanded to the whole network, the pink (other than "OASUC"), green, and blue nodes were assigned to cluster 3. The metabolite abbreviations are listed in Additional file 2.Back to article page